Update cache action version

Author: freyacodes

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
       with:
         java-version: 1.8
     - name: Cache Gradle packages
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.gradle/caches
         key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}